Humidifier



FIG. 1 is a front, right, perspective view of the humidifier;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;and,

FIG. 6 is a top view thereof;

The broken line showing of environmental structure in FIGS. 1-6 is forillustrative purposes only and forms no part of the claimed design.

I claim the ornamental design for a humidifier, as shown and described.